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本篇继上一篇:Silverlight+WCF 实战-网络象棋最终篇之对战视频-上篇[客户端开启视频/注册编号/接收视频](五)

 

 一:对战视频 简单原理

略,内容见上篇。

 

二:对战视频 步骤解析:

略,内容见上篇。

 

三:对战视频 具体实施

1:如何打开视频

略,内容见上篇。

 

2:Silverlight如何使用Socket进行通讯

2.1:与远程建立链接:

2.2:注册编号[这里的规则是“房间号+棋手颜色值”]

2.3:开新线程,等待接收对方视频

2.4:将视频显示出来,需要用主线程来操作

略,以上内容见上篇。作者:路过秋天 博客:http://cyq1162.cnblogs.com/ 秋色园http://www.cyqdata.com/

 

3:图片压缩与视频发送

3.1:图片压缩

我们发送的视频,是通过定时器每秒截5张图发送过去的,每秒钟将产生5张图片,因此,图片压缩变的相当重要。

因此,找一种图片压缩算法,是一种开始:

一开始:是从网上down了个PngEncoder,压缩160*160的截图后,图片大小是40K,看成是4K[因为看字节时是4后面好多0,看少了一个0],兴奋的我~~~

因此一开始在本地测试是正常的,上到网上就oh..no了。

40K*5,即每秒要发送200K的数据,这样就等于把2M/200K带宽给用光了,房东那限制的512K/56K带宽,就更提不上了~~~

最后:还是用上了大伙普通通用的JpgEncoder,压缩160*160的截图后,图片大小是10K,每秒产生10K*5=50K,56K带宽刚好够用了。

 

由于JpgEncoder为第三方插件,因此其代码就不贴了,下面简单介绍下:

1:JpgEncoder下载后内容为:FJ.Core.dll、JpgEncoder.cs两个文件。

2:JpgEncoder.cs有一静态方法,直接可以获取Stream流:

 public static Stream GetStream(WriteableBitmap bitmap)

3:没了~~~

ps:具体FJ.Core.dll、JpgEncoder.cs两个文件可以从下载源码下找到。

 

3.2 视频发送

为了定时发送视频,我们需要开启定时器:

        System.Windows.Threading.DispatcherTimer timer;//全局定义
         public MainPage()
        {
            InitializeComponent();
            timer 
= new System.Windows.Threading.DispatcherTimer();
            timer.Interval 
= TimeSpan.FromSeconds(0.2);//0.2秒一次,每秒5次
            timer.Tick += new EventHandler(timer_Tick);          
        }
        
void timer_Tick(object sender, EventArgs e)
        {
           
//这里就是发送视频的代码了
        }
        
private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            timer.Start();
//点击发送视频时,启动定时器即可
        }

在点击发送触发定时器时,发送视频

        byte[] content = new byte[56 * 1024];
        
int length;       
        
void timer_Tick(object sender, EventArgs e)
        {
            WriteableBitmap img 
= new WriteableBitmap(canVideo, null);
            Stream stream 
= JpgEncoder.GetStream(img); //获取压缩后的流
            length = (int)stream.Length;
            stream.Read(content, 
0, length);
            stream.Close();

            SocketAsyncEventArgs sendEvent 
= new SocketAsyncEventArgs();
            sendEvent.SetBuffer(content, 
0, length);
            videoSocket.SendAsync(sendEvent);
//这里只管发送,发送后的结果不管了。
           
            img 
= null;
        }

 

至此,客户端的一系列动作就完成了,包括[打开视频/注册编号/发送视频/接收视频],下面到服务端代码上场了。

 

4:控制台服务端Socket中转

4.1:额外的处理事件

第一:服务端需要解决跨域问题,这个看过:Silverlight+WCF 新手实例 象棋 WCF通讯跨域(十五)--就会明白Silverlight客户端和通讯端不在同一站点下通讯时,需要解决跨域问题了。

虽然这里没用WCF,改用Socket方式,一样需要解决跨域问题。

第二:用Socket通讯方式,还需要开启另外的943端口监听。

 

不过这两步,网上都有现成的代码,直接copy就可以了。

步骤如下:

1:新建控制台项目—》起名:TCPService

2:新建类文件:PolicyServer.cs,完整代码如下,大伙直接使用就可以了:

PolicyServer类与跨域xml文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace TCPService
{
    
class PolicyServer
    {
        Socket m_listenerIPv4;
        Socket m_listenerIPv6;
        
byte[] m_policy;

        
// pass in the path of an XML file containing the socket policy
        public PolicyServer(string policyContents)
        {
            m_policy 
= Encoding.UTF8.GetBytes(policyContents);

            
// Create the Listening Sockets            
            m_listenerIPv4 = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            m_listenerIPv4.Bind(
new IPEndPoint(IPAddress.Any, 943));
            m_listenerIPv4.Listen(
10);
            m_listenerIPv4.BeginAccept(
new AsyncCallback(OnConnection), m_listenerIPv4);
            
//Console.WriteLine("Listenting on IPv4 port 943.");

            
if (System.Net.Sockets.Socket.OSSupportsIPv6)
            {
                m_listenerIPv6 
= new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
                m_listenerIPv6.Bind(
new IPEndPoint(IPAddress.IPv6Any, 943));
                m_listenerIPv6.Listen(
10);
                m_listenerIPv6.BeginAccept(
new AsyncCallback(OnConnection), m_listenerIPv6);
                
//Console.WriteLine("Listenting on IPv6 port 943.");
            }
            
else
            {
               
// Console.WriteLine("IPv6 is not supported by the system.");
            }
        }

        
// Called when we receive a connection from a client
        public void OnConnection(IAsyncResult res)
        {
            Socket listener 
= (Socket)res.AsyncState;
            Socket client 
= null;

            
try
            {
                client 
= listener.EndAccept(res);
            }
            
catch (SocketException)
            {
                
return;
            }

            
// handle this policy request with a PolicyConnection
            PolicyConnection pc = new PolicyConnection(client, m_policy);

            
// look for more connections
            listener.BeginAccept(new AsyncCallback(OnConnection), listener);
        }

        
public void Close()
        {
            m_listenerIPv4.Close();
            
if (m_listenerIPv6 != null)
            {
                m_listenerIPv6.Close();
            }
        }
    }
    
class PolicyConnection
    {
        Socket m_connection;

        
// buffer to receive the request from the client
        byte[] m_buffer;
        
int m_received;

        
// the policy to return to the client
        byte[] m_policy;

        
// the request that we're expecting from the client
        static string s_policyRequestString = "<policy-file-request/>";

        
public PolicyConnection(Socket client, byte[] policy)
        {
            m_connection 
= client;
            m_policy 
= policy;

            m_buffer 
= new byte[s_policyRequestString.Length];
            m_received 
= 0;

            
try
            {
                
// receive the request from the client
                m_connection.BeginReceive(m_buffer, 0, s_policyRequestString.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
            }
            
catch (SocketException)
            {
                m_connection.Close();
            }
        }

        
// Called when we receive data from the client
        private void OnReceive(IAsyncResult res)
        {
            
try
            {
                m_received 
+= m_connection.EndReceive(res);

                
// if we haven't gotten enough for a full request yet, receive again
                if (m_received < s_policyRequestString.Length)
                {
                    m_connection.BeginReceive(m_buffer, m_received, s_policyRequestString.Length 
- m_received, SocketFlags.None, new AsyncCallback(OnReceive), null);
                    
return;
                }

                
// make sure the request is valid
                string request = System.Text.Encoding.UTF8.GetString(m_buffer, 0, m_received);
                
if (StringComparer.InvariantCultureIgnoreCase.Compare(request, s_policyRequestString) != 0)
                {
                    m_connection.Close();
                    
return;
                }

                
// send the policy
                m_connection.BeginSend(m_policy, 0, m_policy.Length, SocketFlags.None, new AsyncCallback(OnSend), null);
            }
            
catch (SocketException)
            {
                m_connection.Close();
            }
        }

        
// called after sending the policy to the client; close the connection.
        public void OnSend(IAsyncResult res)
        {
            
try
            {
                m_connection.EndSend(res);
            }
            
finally
            {
                m_connection.Close();
            }
        }
    }
//跨域用的xml文件,以代码的方式传入。
public static class SocketPolicy
    {
        
public const string Policy = @"
            <?xml version=""1.0"" encoding =""utf-8""?>
            <access-policy>
              <cross-domain-access>
                <policy>
                  <allow-from>
                    <domain uri=""*"" />
                  </allow-from>
                  <grant-to>
                    <socket-resource port=""4502-4530"" protocol=""tcp"" />
                  </grant-to>
                </policy>
              </cross-domain-access>
            </access-policy>
            
";
    }
}

3:控制台启动首行代码

 static void Main(string[] args)
 {
    PolicyServer ps 
= new PolicyServer(SocketPolicy.Policy);//Silverlight跨域访问与开启943端口
  }

 

至此,我们添加了个额外的处理类来解决943端口和跨域问题[注意上面代码中xml的端口号配置范围哦],下面开始自己的服务端处理流程

 

4.2:服务端处理流程

4.2.1:开启监听

namespace TCPService
{
    
class Program
    {
        
public static Dictionary<int, ThreadProxy> soketList;//房号+颜色值
         static void Main(string[] args)
        {
            PolicyServer ps 
= new PolicyServer(SocketPolicy.Policy);//Silverlight跨域访问及943端口
            
//主线程监听
            soketList = new Dictionary<int, ThreadProxy>();
            Console.WriteLine(
"TCPService正在启动运行");
            IPEndPoint ip 
= new IPEndPoint(IPAddress.Any, 4505);//本地任意IP及4505端口
            Socket mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            mainSocket.Bind(ip);
            mainSocket.Listen(
-1);
            
while (true)
            {
                Socket socket 
= mainSocket.Accept();
                
new ThreadProxy(socket).Run();//收到消息即时处理。

            }
        }
        
public static void WriteLine(string msg)
        {
            Console.WriteLine(msg);
        }
    }
    
class ThreadProxy
    {
        
public Socket socket;
        
public ThreadProxy(Socket newSocket)
        {
            socket 
= newSocket;
        }
        
public void Run()
        {
            Thread thread 
= new Thread(new ThreadStart(Action));
            thread.Start();
        }
        
public void Action()
        {
            Program.WriteLine(
"有人来了----");
            
//下面开启处理逻辑
        }
   }
}

 

说明:

这里要注意的是监听的端口号必须要跨域文件配置的范围内。同时用一字典泛型soketList保存了所以注册的用户通讯socket,这样可以方便查找对方的socket进行中转。

 

4.2.2 定义下全局变量

        public Socket socket;//我方的Socket
        ThreadProxy youThreadProxy;//对方
        int num;//注册的编号
        byte[] buffer = new byte[30 * 1024];//缓冲字节30K,简单说就是用户10K发送3次,这里收到满30K才转发一次
        bool firstConn = true;//是否第一次建立链接,首次链接都是注册编号,不发送视频的;

 

4.2.3 处理编号注册、移除、查找对方

编号注册:

        private void RegSocket(string key)
        {
            firstConn 
= false;//注册完后,设置下标识
            if (key.Length < 10)//字节太多就是图片流了
            {
                
if (int.TryParse(key, out num))
                {
                    
if (Program.soketList.ContainsKey(num))//之前都有人在了
                       {
                        Program.soketList[num].socket.Close();
                        Program.soketList[num].socket.Dispose();
                        Program.soketList.Remove(num);
                    }
                    Program.soketList.Add(num, 
this);
                    Program.WriteLine(
"用户注册:" + key);
                    FindYouSocket();
                    
return;
                }
            }
        }

线程错误,编号移除:

       private void OnError(ThreadProxy errorProxy,string errorMsg)
        {
            
if (errorProxy.socket != null)
            {
                errorProxy.socket.Close();
            }
            Console.WriteLine(
"删除用户:" + errorProxy.num +"错误信息:"+ errorMsg);
            Program.soketList.Remove(errorProxy.num);
            
        }

查询对方:

       private void FindYouSocket()
       {
            
int youNum = num % 2 == 0 ? num - 1 : num + 1;
            
if (Program.soketList.ContainsKey(youNum))
            {
                youThreadProxy 
= Program.soketList[youNum];
            }
         }

 

4.2.4 主业务处理中转流程

       public ThreadProxy(Socket newSocket)
        {
            socket 
= newSocket;
            socket.SendBufferSize 
= buffer.Length;
            socket.ReceiveBufferSize 
= buffer.Length;
        }
        
public void Run()
        {
            Thread thread 
= new Thread(new ThreadStart(Action));
            thread.Start();
        }
        
public void Action()
        {
            Program.WriteLine(
"有人来了----");
            
try
            {
                
while (true)
                {
                    
if (socket.Connected)
                    {
                        
int length = 0, count = 0;
                        
do
                        {
                            System.Threading.Thread.Sleep(
20);//关键点,请求太快数据接收不全
                            length = socket.Receive(buffer, count, socket.Available, 0);
                            count 
= count + length;

                        }
                        
while (socket.Available > 0);

                        
if (count > 1)
                        {

                            
if (count < 4)//小字节,命令字符
                            {
                                
if (firstConn)//首次登陆,需要注册ID
                                {
                                    
string key = ASCIIEncoding.ASCII.GetString(buffer, 0, count);
                                    RegSocket(key);
                                }
                            }
                            
else if (youThreadProxy == null)
                            {
                                Program.WriteLine(
"没人接收。。。");
                                FindYouSocket();
                            }
                            
else if (youThreadProxy.canReceive)//对方允许接收图片发送
                                {
                                Program.WriteLine(
"图片来了:" + count);
                                
if (youThreadProxy.socket.Connected)
                                {
                                    Program.WriteLine(
"图片转发:" + buffer.Length);
                                    
try
                                    {
                                        youThreadProxy.socket.Send(buffer, count, 
0);
                                    }
                                    
catch(Exception err)
                                    {
                                        OnError(youThreadProxy, err.Message);
                                    }
                                }
                            }
                        }
                    }
                    
else
                    {
                        OnError(
this,"socket链接已关闭");
                        
break;
                    }
                }
            }
            
catch(Exception err)
            {
                OnError(
this,err.Message);
            }

        }

处理流程也很简单,根据请求的字节大小来调用是“注册”还是“中转”。

至此,整个完整的视频传输篇完成了,完成的图片和上一节一样了:

 

 

最后是大家期待已久的示例源码下载:点击下载 [别忘了留下言推荐下哦^-^]

说明:视频源码中的内容会多一些,包括一开始我写的一些其它杂七杂八的代码,不过不影响整个的运行。

 

最后:谢谢大家对本系列的喜欢,谢谢支持~

PS:传说点一下推荐会有10个园豆,喜欢麻烦点一下“推荐”,thank you very much!!

 

posted on 2010-12-03 12:37 路过秋天 阅读(...) 评论(...) 编辑 收藏
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